{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64313", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.779Z", "datePublished": "2026-07-25T08:49:44.546Z", "dateUpdated": "2026-08-17T04:53:13.285Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:53:13.285Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ecc - Fix carry overflow in vli multiplication\n\nThe carry flag calculation fails when r01.m_high is saturated\n(0xFFFFFFFFFFFFFFFF) and addition of lower bits overflows.\n\nThe condition (r01.m_high < product.m_high) doesn't handle the case\nwhere r01.m_high == product.m_high and an additional carry exists\nfrom lower-bit overflow.\n\nWhen commit 3c4b23901a0c (\"crypto: ecdh - Add ECDH software support\")\nintroduced crypto/ecc.c, it split the muladd() function in the\nmicro-ecc library into separate mul_64_64() and add_128_128() helpers.\nIt seems the check got lost in translation.\n\nAdd proper handling for this boundary by accounting for the carry\nfrom the lower addition." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The concrete unauthenticated external path is Bluetooth LE Secure Connections, where a nearby peer's SMP Public Key message reaches the flawed ECC multiplication. Bluetooth requires proximity rather than routable network access.\nAC:L - The attacker controls the ECC operands and can repeatedly submit deliberately constructed values that trigger the carry error. No race, unpredictable memory layout, or victim-controlled state is required.\nPR:N - SMP permits a peer to negotiate Secure Connections and submit its public key before credential validation, DHKey confirmation, or bonding completes. No local account or capability is required.\nUI:N - The peer's public key is validated and the ECDH secret is computed before authentication-method completion. Headless and Just Works deployments require no human action.\nS:U - The vulnerable arithmetic and affected cryptographic consumers operate within the same kernel security authority. The vulnerability does not inherently cross a VM, IOMMU, or comparable security boundary.\nC:H - Incorrect field multiplication can undermine public-key validation and ECDH shared-secret computation. Faulty-curve or key-agreement attacks could expose secrets and all data protected by derived session keys.\nI:H - The same faulty multiplication supports ECDSA and ECRDSA verification, making false cryptographic results and signature or peer-authentication bypass defensible. This can authorize attacker-controlled content, code, or commands.\nA:H - Authentication bypass can authorize attacker-controlled code or commands capable of halting the system, while repeated crafted exchanges can prevent secure pairing. Safety-critical or headless devices dependent on the affected trust path can lose their protected function completely." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "crypto/ecc.c" ], "versions": [ { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "d11b2bb99bec1f5557c01cac42231e23745f49b8", "status": "affected", "versionType": "git" }, { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "b709e0e768766abe29a49e1c1922a1604be602f4", "status": "affected", "versionType": "git" }, { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "24a54dfa06d09813b4802a374fad3d2c0e16a884", "status": "affected", "versionType": "git" }, { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "677450e5ef850c4d28b7956aa01104548c2a894e", "status": "affected", "versionType": "git" }, { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "5275e0fca256d081e2e7d4ba3dd8216c6e50d44e", "status": "affected", "versionType": "git" }, { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "774ddddf5eb26eeca177350413e3e2bc50930ee9", "status": "affected", "versionType": "git" }, { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "ebaae7c4251cc0cdb2602f334d4f08a3e82d271e", "status": "affected", "versionType": "git" }, { "version": "3c4b23901a0c766879dff680cd6bdab47bcdbbd2", "lessThan": "27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "crypto/ecc.c" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d11b2bb99bec1f5557c01cac42231e23745f49b8" }, { "url": "https://git.kernel.org/stable/c/b709e0e768766abe29a49e1c1922a1604be602f4" }, { "url": "https://git.kernel.org/stable/c/24a54dfa06d09813b4802a374fad3d2c0e16a884" }, { "url": "https://git.kernel.org/stable/c/677450e5ef850c4d28b7956aa01104548c2a894e" }, { "url": "https://git.kernel.org/stable/c/5275e0fca256d081e2e7d4ba3dd8216c6e50d44e" }, { "url": "https://git.kernel.org/stable/c/774ddddf5eb26eeca177350413e3e2bc50930ee9" }, { "url": "https://git.kernel.org/stable/c/ebaae7c4251cc0cdb2602f334d4f08a3e82d271e" }, { "url": "https://git.kernel.org/stable/c/27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406" } ], "title": "crypto: ecc - Fix carry overflow in vli multiplication", "x_generator": { "engine": "bippy-1.2.0" } } } }